3M™ Dual Lock™ reclosable fasteners lock together using rows of mushroom-shaped stems which is a locking system that is up to five times stronger than traditional hook-and-loop tape. Our Trial Bags allow you to experiment on your own substrates, including metals, composites, HSE plastics and coated surfaces, with the right stem density, adhesive system and fastening strength for the job, before moving onto full rolls.
Why Choose 3M Dual Lock Trial Bags?
Trial Bags take the risk out of material qualification. Trial Bags allow you to test 3M™ Dual Lock™ against real-world conditions on your own environment, load and surface. Each strip has a 3M™ reclosable mushroom-head interlock that has up to five times the tensile and shear holding power of conventional hook-and-loop systems.
They're ideal when you need to confirm:
- Required stem density (170, 250, or 400) for the correct balance of shear strength and re-engagement life
- Compatibility with high surface energy (HSE) substrates such as aluminum, stainless steel, and glass
- Performance on low surface energy (LSE) plastics when paired with the correct adhesive system
- Pull-apart resistance, cycling endurance, vibration damping, and reusability
Trial Bags allow engineers, fabricators, OEMs and makers to try and choose the most appropriate Dual Lock™ configuration, prior to production. If you already know the product you require, browse our full 3M™ Dual Lock™ range.
Technical Specifications
Each Trial Bag varies by SKU, but most include:
- Mushroom-shaped stems that engage with a tactile "snap" indicating full closure
- High tensile and shear strength, depending on stem density
- Indoor/outdoor durability, including UV and moisture resistance for selected acrylic-adhesive versions
- Adhesive options: high-performance acrylic adhesives for metals, HSE plastics, powder coat, and painted surfaces, plus LSE-friendly variants for polypropylene and polyethylene
- Temperature resistance (product dependent): typically -30 C to +90 C
- Cycle life that supports repeated opening and closing without significant loss in holding power
These shorter test lengths allow you to validate real-world operation on a smaller order.
Application Guide
To maximize the holding power of 3M™ Dual Lock™ fasteners:
- Prepare the substrate: Clean with isopropyl alcohol (IPA) and let dry. Some low surface energy plastics may require 3M™ Primer 94.
- Apply firm, continuous pressure: Dual Lock™ adhesives are pressure-sensitive. They perform best when good contact is made over the entire surface.
- Allow dwell time: Acrylic adhesives take 24-72 hours to reach full strength. Do not load the fastener too soon.
- Engage the stems fully: Slide pieces into alignment, then press until you hear or feel the "snap" of full engagement.
- Test the cycling performance: How does the stem density perform after repeated cycles of opening and closing in the field?
Frequently Asked Questions
Are 3M™ Dual Lock™ Trial Bags reusable?
Yes. The Dual Lock™ reclosable fastener system can be opened and re-closed many times without significant degradation of shear or tensile strength.
Do Trial Bags include adhesive-backed and non-adhesive options?
That depends on the SKU. Some are plain-back (no adhesive), allowing sewing or bonding using a liquid adhesive or mechanical fasteners. Others are pre-coated with 3M™ factory-applied acrylic adhesives to bond to metals, plastics and various composites.
Will 3M™ Dual Lock™ work on powder-coated surfaces?
Most acrylic adhesive SKUs are compatible with powder coat, as long as the surface is clean and the full cure time is allowed.
Can I test different stem densities in one order?
Yes. Trial Bags are made to let you compare the performance of 170, 250 and 400 stem options.
Is 3M™ Dual Lock™ stronger than Velcro?
The interlocking stems of Dual Lock™ produce roughly five times the tensile strength of hook-and-loop fasteners. They also outperform woven loop fabrics when it comes to handling shock, vibration, and lateral shear forces, making them the stronger choice for industrial and outdoor use.